Overcoming challenges in the evolution and nature of massive stars

Deliverables

"Report on Summer School ""Massive Stars and Machine Learning"""
Communication, dissemination and exploitation plan

Publications

Discovery of a transitional type of evolved massive star with a hard ionizing flux

Author(s): Andreas A. C. Sander, Roel R. Lefever, Joris Josiek, Erin R. Higgins, Raphael Hirschi, Lidia M. Oskinova, Daniel Pauli, Max Pritzkuleit, John S. Gallagher, Wolf-Rainer Hamann, Ilya Mandel, Varsha Ramachandran, Tomer Shenar, Helge Todt, Jorick S. Vink
Published in: Nature Astronomy, Issue 10, 2026, ISSN 2397-3366
Publisher: Springer Science and Business Media LLC
DOI: 10.1038/S41550-025-02719-Z

Photometric and spectroscopic variability of the blue supergiant <i>ρ</i> Leo

Author(s): V. A. Checha, A. Aret, I. Kolka, T. Liimets, I. Araya, A. Christen, G. F. Avila Marín, R. S. Levenhagen, L. Cidale, T. Eenmäe, G. Hajiyeva, Ü. Kivila, V. Mitrokhina, H. Ramler, T. Verro
Published in: Astronomy & Astrophysics, Issue 706, 2026, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202556042

Near-infrared characterization of evolved massive stars in M31 and M33

Author(s): Michaela Kraus, María Laura Arias, Michalis Kourniotis, Andrea F Torres, Lydia S Cidale, Marcelo Borges Fernandes
Published in: Monthly Notices of the Royal Astronomical Society, Issue 541, 2025, ISSN 0035-8711
Publisher: Oxford University Press (OUP)
DOI: 10.1093/MNRAS/STAF1240

High-resolution Near-Infrared Spectroscopy of the B[e] Supergiant LHA 115-S 18: Discovery of Hot Water Vapor Emission

Author(s): María Laura Arias, Andrea Fabiana Torres, Michaela Kraus, Lydia Sonia Cidale
Published in: The Astrophysical Journal Letters, Issue 1000, 2026, ISSN 2041-8205
Publisher: American Astronomical Society
DOI: 10.3847/2041-8213/AE524A

Minimum and maximum mass-luminosity relations for stripped stars

Author(s): Gautham N. Sabhahit, Jorick S. Vink, Andreas A. C. Sander, Varsha Ramachandran
Published in: Astronomy & Astrophysics, Issue 703, 2025, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202554852

Binarity at LOw Metallicity (BLOeM)

Author(s): D. J. Lennon, S. R. Berlanas, A. Herrero, N. Britavskiy, P. L. Dufton, N. Langer, H. Jin, A. Schootemeijer, A. Menon, J. Bestenlehner, P. Crowther, J. S. Vink, J. Bodensteiner, T. Shenar, K. Deshmukh, J. I. Villaseñor, L. Patrick, F. Najarro, A. de Koter, L. Mahy, D. M. Bowman, A. Bobrick, C. J. Evans, M. Gull, G. Holgado, Z. Katabi, J. Kubát, P. Marchant, D. Pauli, M. Pawlak, M. Renzo, D. F. Rocha, A. A. C. Sander, T. Sayada, S. Simón-Díaz, M. Stoop, R. Valli, C. Wang, X.-T. Xu
Published in: Astronomy & Astrophysics, Issue 707, 2026, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202558539

X-Shooting ULLYSES: Massive stars at low metallicity

Author(s): T. Alkousa, P. A. Crowther, J. M. Bestenlehner, H. Sana, F. Tramper, J. S. Vink, F. Najarro, A. A. C. Sander, M. Bernini-Peron, L. Oskinova, J. Th. van Loon, R. Kuiper
Published in: Astronomy & Astrophysics, Issue 707, 2026, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202557856

Metal-poor single Wolf-Rayet stars: The interplay of optically thick winds and rotation

Author(s): Lumen Boco, Michela Mapelli, Andreas A. C. Sander, Sofia Mesini, Varsha Ramachandran, Stefano Torniamenti, Erika Korb, Boyuan Liu, Gautham N. Sabhahit, Jorick S. Vink
Published in: Astronomy & Astrophysics, Issue 703, 2025, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202556187

The IACOB project

Author(s): G. Holgado, S. Simón-Díaz, A. Herrero
Published in: Astronomy & Astrophysics, Issue 703, 2025, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202556713

MONOS: Multiplicity Of Northern O-type Spectroscopic systems

Author(s): G. Holgado, J. Maíz Apellániz, R. C. Gamen
Published in: Astronomy & Astrophysics, Issue 701, 2025, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202556068

A candidate proton cyclotron feature in the ultraluminous X-ray source NGC 4656 ULX-1

Author(s): Nelson Cruz-Sanchez, Enzo A. Saavedra, Federico A. Fogantini, Federico García, Jorge A. Combi, Matteo Bachetti, Matteo Imbrogno, Lara Sidoli, Alessio Marino
Published in: Astronomy & Astrophysics, Issue 707, 2026, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202658875

Near-Eddington mass loss of hydrogen-rich Wolf-Rayet stars

Author(s): R. R. Lefever, A. A. C. Sander, M. Bernini-Peron, G. González-Torà, N. M. Moens, F. Najarro, E. C. Schösser, G. N. Sabhahit, J. S. Vink
Published in: Astronomy & Astrophysics, Issue 700, 2025, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202554505

Efficiency of viscous angular momentum transport in dissipating Be binaries

Author(s): Peter Quigley, Carol E. Jones, Kenneth Gayley, Anahí Granada, Stan Owocki, Rina G. Rast, Mark W. Suffak, Atsuo T. Okazaki, Asif ud-Doula, Jiří Krtička, Alex C. Carciofi, Jeremy J. Drake
Published in: Astrophysics and Space Science, Issue 370, 2025, ISSN 0004-640X
Publisher: Springer Science and Business Media LLC
DOI: 10.1007/S10509-025-04494-9

Low-metallicity massive single stars with rotation

Author(s): Dorottya Szécsi, Frank Tramper, Brankica Kubátová, Carolina Kehrig, Jiří Kubát, Jiří Krtička, Andreas A. C. Sander, Miriam Garcia
Published in: Astronomy & Astrophysics, Issue 703, 2025, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202452483

New self-consistent theoretical descriptions for mass-loss rates of O-type stars

Author(s): F. Figueroa-Tapia, J. A. Panei, M. Curé, I. Araya, S. Ekström, A. C. Gormaz-Matamala, R. O. J. Venero, L. S. Cidale
Published in: Astronomy & Astrophysics, Issue 707, 2026, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202558657

SDSS-V LVM: Detectability of Wolf-Rayet stars and their He II ionizing flux in low-metallicity environments

Author(s): G. González-Torà, A. A. C. Sander, E. Egorova, R. R. Lefever, V. Ramachandran, O. V. Egorov, J. Josiek, E. C. Schösser, M. Bernini-Peron, K. Kreckel, A. Wofford, O. G. Telford, P. Senchyna, C. Leit
Published in: Astronomy & Astrophysics, Issue 703, 2025, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202557041

Mass-loading of outflows from evolving young massive clusters

Author(s): C. J. K. Larkin, C. Hawcroft, J. Mackey, R. R. Lefever, L. Härer, A. A. C. Sander
Published in: Astronomy & Astrophysics, Issue 703, 2025, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202557130

Identification of Possible Stellar Companions via Speckle Interferometry in a Sample of Be Stars II

Author(s): C. A. Guerrero, T. B. Souza, M. Borges Fernandes, A. D. Guajardo Jurado
Published in: The Astronomical Journal, Issue 169, 2025, ISSN 0004-6256
Publisher: American Astronomical Society
DOI: 10.3847/1538-3881/ADBF11

A broadband X-ray view of the ultraluminous sources in the galaxies ESO 501–023 and IC 5052

Author(s): N. Cruz-Sanchez, F. A. Fogantini, E. A. Saavedra, L. Abaroa, F. García, J. A. Combi, G. E. Romero
Published in: Astronomy & Astrophysics, Issue 693, 2025, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202452187

2D unified atmosphere and wind simulations for a grid of O-type stars

Author(s): N. Moens, D. Debnath, O. Verhamme, F. Backs, C. Van der Sijpt, J. O. Sundqvist, A. A. C. Sander
Published in: Astronomy & Astrophysics, Issue 704, 2025, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202556825

Shaping the interstellar medium through expanding H I shells

Author(s): L. A. Suad, J. A. Molina Lera, S. B. Cárdenas, S. Cichowolski
Published in: Astronomy & Astrophysics, Issue 707, 2026, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202554309

Effect of gravity darkening and oblate factor in rapidly rotating massive stars

Author(s): Bhawna Mukhija, Michel Curé, Ignacio Araya, Catalina Arcos, Alejandra Christen
Published in: Astronomy & Astrophysics, Issue 703, 2025, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202555634

Hydrodynamical mass-loss rates for very massive stars

Author(s): Gautham N. Sabhahit, Jorick S. Vink, Andreas A. C. Sander
Published in: Astronomy & Astrophysics, Issue 706, 2026, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202557298

ReTrOH-UNLP: Conservation of the Historical Observational Work of the Astronomical Observatory of La Plata with Computer Vision

Author(s): Santiago Andrés Ponte Ahón, Yael Aidelman, Juan Martín Seery, Facundo Manuel Quiroga, Franco Ronchetti, Waldo Hasperué, Matilde Iannuzzi, Romina Peralta, Mónica Lopez, Aurelio F. Bariviera, Lydia
Published in: Journal on Computing and Cultural Heritage, Issue 18, 2025, ISSN 1556-4673
Publisher: Association for Computing Machinery (ACM)
DOI: 10.1145/3754333

New constraints on the binary system HD 327083 and its gaseous and dusty environments

Author(s): L. Cidale, P. Marchiano, M. Kraus, I. Andruchow, M. L. Arias, M. Curé, M. Borges Fernandes, Y. Aidelman, A. F. Torres, I. Araya, G. Maravelias, J. Zorec, Y. Cochetti, J. Panei
Published in: Astronomy & Astrophysics, Issue 706, 2026, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202451636

The hard ultraluminous state of NGC 5055 ULX X-1

Author(s): N. Cruz-Sanchez, E. A. Saavedra, F. A. Fogantini, F. García, J. A. Combi
Published in: Astronomy & Astrophysics, Issue 705, 2026, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.48550/ARXIV.2511.13686

Constraints on cyclotron features and accretion regime in the high-mass X-ray binary 4U 1700–37 from NuSTAR

Author(s): L. West-Ocampo, F.A. Fogantini, E.A. Saavedra, J.A. Combi, F. García, P.L. Luque-Escamilla, J. Martí, S. Chaty, J.F. Albacete-Colombo
Published in: Journal of High Energy Astrophysics, Issue 52, 2026, ISSN 2214-4048
Publisher: Elsevier BV
DOI: 10.1016/J.JHEAP.2026.100567

"A multi-stage machine learning-based method to estimate wind parameters from H <mml:math xmlns:mml=""http://www.w3.org/1998/Math/MathML"" altimg=""si289.svg"" display=""inline"" id=""d1e2694""> <mml:mi>α</mml:mi> </mml:math> lines of massive stars"

Author(s): Felipe Ortiz, Raquel Pezoa, Michel Curé, Ignacio Araya, Roberto O.J. Venero, Catalina Arcos, Pedro Escárate, Natalia Machuca, Alejandra Christen
Published in: Astronomy and Computing, Issue 52, 2025, ISSN 2213-1337
Publisher: Elsevier BV
DOI: 10.1016/J.ASCOM.2025.100941

ISOSCELES project: A grid-based quantitative spectroscopic analysis of massive stars

Author(s): I. Araya, M. Curé, N. Machuca, R. O. J. Venero, S. Cuéllar, C. Arcos, L. S. Cidale
Published in: Astronomy & Astrophysics, Issue 704, 2025, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202555509

Dynamically consistent analysis of Galactic WN4b stars

Author(s): R. R. Lefever, A. A. C. Sander, M. Bernini-Peron, G. González-Torà, W.-R. Hamann, J. Josiek, V. Ramachandran, E. C. Schösser, H. Todt
Published in: Astronomy & Astrophysics, Issue 707, 2026, ISSN 0004-6361
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202558211

PCA-enhanced Speckle Interferometry with Bicubic Interpolation at the OAN-SPM México

Author(s): C. A. Guerrero, D. O. Ochoa, B. Hernández-Valencia, T. Benadalid, I. A. Peralta-Mendoza, E. Romero Hernández, F. A. García-Castillo, S. Ayala, J. E. Pérez-León, F. J. Tamayo, A. Avilés, E. Sánc
Published in: The Astronomical Journal, Issue 170, 2025, ISSN 0004-6256
Publisher: American Astronomical Society
DOI: 10.3847/1538-3881/AE0CC2

Deliverables

Publications

Download Download the content of the page